The Tektronix TDS644B is a four-channel, 500 MHz digitizing oscilloscope built for high-speed signal analysis and waveform characterization. It delivers 2.5 GS/s sampling per channel with 8-bit vertical resolution, expandable to over 11 bits through averaging. With up to 15,000 points record length per channel, the instrument captures complex transients and repetitive signals with exceptional detail. A full suite of acquisition modes—peak detect, sample, envelope, and average—combined with edge, pulse, logic, and video trigger types provides the flexibility needed for demanding measurement tasks. Integrated waveform math, FFT, and pass/fail testing enable rapid signal validation without external analysis tools.

Technical Specifications

• Bandwidth: 500 MHz
• Channels: 4
• Sampling Rate: 2.5 GS/s per channel
• Vertical Resolution: 8-bit (enhanced to >11 bits with averaging)
• Record Length: Up to 15,000 points per channel
• Vertical Sensitivity: 1 mV/div to 10 V/div
• Vertical Accuracy: 1.5%
• Time Base Range: 500 ps/div to 5 s/div
• Time Base Accuracy: ±100 ppm over intervals >1 ms
• Input Impedance: 1 MΩ // 10 pF or 50 Ω
• Input Coupling: AC, DC, or GND
• Single-Shot Bandwidth: <100 ps typical @ 2.5 GS/s
• Maximum Input Voltage: 300 V CAT II, ±400 V peak

– Key Features

• Peak detect acquisition (1 ns for TDS644B)
• Advanced triggering: edge, pulse width, glitch, runt, slew rate, timeout, pattern, state, and setup & hold time violation
• Optional video trigger (NTSC, PAL, HDTV, FlexFormat)
• Waveform math and FFT
• Fully automated measurement system
• Waveform pass/fail testing
• sin(x)/x or linear interpolation
• Color VGA display
• GPIB, RS-232, and Centronics interfaces

– Typical Applications

Electronics design validation, telecommunications signal analysis, and high-energy physics measurements benefit from the TDS644B's combination of bandwidth, sampling density, and triggering sophistication.

– Compatibility & Integration

Tekprobe BNC connectors support P6243 FET probes, P6139A passive probes, P6245 1.5 GHz active probes, optional 500 MHz 20X SMD probes, and 1 GHz active probes. Standard accessories include front cover and accessory pouch. Video trigger and additional options available.